| T422X6 | Underdosing of succinimides and oxazolidinediones |
| T422X6A | Underdosing of succinimides and oxazolidinediones, initial encounter |
| T422X6D | Underdosing of succinimides and oxazolidinediones, subsequent encounter |
| T422X6S | Underdosing of succinimides and oxazolidinediones, sequela |
| T423 | Poisoning by, adverse effect of and underdosing of barbiturates |
| T423X | Poisoning by, adverse effect of and underdosing of barbiturates |
| T423X1 | Poisoning by barbiturates, accidental (unintentional) |
| T423X1A | Poisoning by barbiturates, accidental (unintentional), initial encounter |
| T423X1D | Poisoning by barbiturates, accidental (unintentional), subsequent encounter |
| T423X1S | Poisoning by barbiturates, accidental (unintentional), sequela |
| T423X2 | Poisoning by barbiturates, intentional self-harm |
| T423X2A | Poisoning by barbiturates, intentional self-harm, initial encounter |
| T423X2D | Poisoning by barbiturates, intentional self-harm, subsequent encounter |
| T423X2S | Poisoning by barbiturates, intentional self-harm, sequela |
| T423X3 | Poisoning by barbiturates, assault |
| T423X3A | Poisoning by barbiturates, assault, initial encounter |
| T423X3D | Poisoning by barbiturates, assault, subsequent encounter |
| T423X3S | Poisoning by barbiturates, assault, sequela |
| T423X4 | Poisoning by barbiturates, undetermined |
| T423X4A | Poisoning by barbiturates, undetermined, initial encounter |
| T423X4D | Poisoning by barbiturates, undetermined, subsequent encounter |
| T423X4S | Poisoning by barbiturates, undetermined, sequela |
| T423X5 | Adverse effect of barbiturates |
| T423X5A | Adverse effect of barbiturates, initial encounter |
| T423X5D | Adverse effect of barbiturates, subsequent encounter |
| T423X5S | Adverse effect of barbiturates, sequela |
| T423X6 | Underdosing of barbiturates |
| T423X6A | Underdosing of barbiturates, initial encounter |
| T423X6D | Underdosing of barbiturates, subsequent encounter |
| T423X6S | Underdosing of barbiturates, sequela |
| T424 | Poisoning by, adverse effect of and underdosing of benzodiazepines |
| T424X | Poisoning by, adverse effect of and underdosing of benzodiazepines |
| T424X1 | Poisoning by benzodiazepines, accidental (unintentional) |
| T424X1A | Poisoning by benzodiazepines, accidental (unintentional), initial encounter |
| T424X1D | Poisoning by benzodiazepines, accidental (unintentional), subsequent encounter |
| T424X1S | Poisoning by benzodiazepines, accidental (unintentional), sequela |
| T424X2 | Poisoning by benzodiazepines, intentional self-harm |
| T424X2A | Poisoning by benzodiazepines, intentional self-harm, initial encounter |
| T424X2D | Poisoning by benzodiazepines, intentional self-harm, subsequent encounter |
| T424X2S | Poisoning by benzodiazepines, intentional self-harm, sequela Poisoning by benzodiazepines, intentional self-harm, sequela |
| T424X3 | Poisoning by benzodiazepines, assault |
| T424X3A | Poisoning by benzodiazepines, assault, initial encounter |
| T424X3D | Poisoning by benzodiazepines, assault, subsequent encounter |
| T424X3S | Poisoning by benzodiazepines, assault, sequela |
| T424X4 | Poisoning by benzodiazepines, undetermined |
| T424X4A | Poisoning by benzodiazepines, undetermined, initial encounter |
| T424X4D | Poisoning by benzodiazepines, undetermined, subsequent encounter |
| T424X4S | Poisoning by benzodiazepines, undetermined, sequela |
| T424X5 | Adverse effect of benzodiazepines |
| T424X5A | Adverse effect of benzodiazepines, initial encounter |